[li'l Sonz]

Most land snails and slugs possess both male and female parts. In some species, an individual may behave as male for a while, then as a female. When snails mate, as in the drawing below, two individuals pull up next to one another, arrange themselves so that the male part of one is opposite the female part of the other, and then each ejects male sperm into the female opening of the other. In a few snail and slug species, self-fertilization occurs -- an hermaphroditic individual mates with itself and produces offspring.


That's how!